Process for recovery of cane-sugar.



E. E. BAT'IELLE. PROCESS FOR RECOVERY o? GANE SUGAR APPLICATION 1EILIJDJULY 17. i909.

Patented Nov, 12. w12.

. exa-ct descriptionmf the "recovery of cane'sugar,

^ tion of glucose,

' infr Manners @opy UNTTED STATES PATENT oEEior-,

EUGENE ERLE BATTELLE, OF WAII-JUKU, TERRITORY 0F HAWAII.

rnOcEss FOB.

RECOVERY OE CANESUGAR.

Specification of Letters Patent.

Application led July 17, 1909. Self-Kal No. 508,139.

Patented Nov. l2, 1912.

To all whom 'Lt may concern.'

Beit known that I, Epoux-n ERLE BAT- TELLE, a citizen of the UnitedStates, residing at Wailuku, county of Maui, Territory of Hawaii, haveinvented certain new and useful Improvements in Processes for Recoveryof Cane-Sugar; and I do hereby declare the following to be a full,clear, and invention, such as will enable othersskilled in the art towhich it appertains to make and u'se the same.

My invention relates to processes for the a`process for themanufactureof raw-sugars from juices, syrups, molasses and massecuites containingglucose, knofwn as invert sugar; and has for its objects, the elimina'-the increasing ofthe purities of. the materials, t1ie production v of asingle 'grade of markV table' sugar, and the extraction of a maximumamount of sugarV .from s glptions with ammimumloss of the sugarcontained in the 'initial material.;4

The invention consists. in the Anovel process, as hereinafter set forthand claimed.

My process can be carried out in existing sugar factories witheconomical results. The glucose is eliminated by addition of sufficientalkaline earths, boiling and filtering, the solution being boiledprevious to a treatment with carbonio acid, as hereinafter ex-A plained.By the elimination of the glucose,

. the pui-ities of all materials are increased.

i reboiling, redrying and filtered either by decantation or othermeans,

the juice concentrated and boiled to grain, the latter operation beingrepeated until there is no longer a profitable recovery of sugar, andfinally the. exhausted or waste molasses still containing from.30% to40% cane sugar is disposedl of at little or no profit. All the productsfrom juice to exhausted molasses being more or lessl rich in glucose,increases the number of boihngs and particularly to.

the solution is boiled.

(grades of sugaiii) and makes it. impossible to recover more sugar fromthe above nientioned exhausted molasses.

In carrying out my improved process', the raw juice is lilned with quickllime, milk of lime, saccharate of lime, or its equivalent of thealkaline earth group, to from 1% to 5% of the weight ofthe juice. It. isthen boiled, either by pumping through a heater, or by other means ofattaining this end. No

"definite amount of alkali can 4be specified as the percentage ofglucose is variable, but sutiicient alkalinity is maintained tocompletely destroy all' traces of glucose after hot' solution is`runinto a tank, where acid is passed through of the solution shows an 115%@2%,

stopped, and the sol 'tion' s either jby.', decantation o1"carbonatation referably A carbonio acld alkalinity of from is filterpressed. uid isnowesent tank, where the alkalinityy is increased ifdesired, and' carbonio acid 1s again passed through the solution untilall or nearly all of the metal is thrown down as carbonate.

In juices or sugar liquors containing a low percentage of glucose thesingle4 car- `The resultingltered liq-l 'o After boiling, the Y 1t untila ilt'eredsample i,

'whenthe carbonio 'acid is then filtered, 4 l by mechanical I means."vInthe. former case, the precipitate 1 to a second carbonatationbonatation is sufficient, provided that thev metal in solution iscompletely, or nearly so, removed by continued carbonio acid ap'-plication. In either case th'e filtered solution is now concentrated tosyrup.

The-invention so far as above disclosed applies not only to themanufacture of raw sugar,' but'it may nection with the ,refining use.Should the raw sugar to vbe refined lcontain glucose, the remeltsugars,Syrups,

molasses or massecuites, may be treatedby the above described. processto decompose the invert sugar, the latter. passing away with thelsludgeor press-cake. 4

After evaporating the solutions (juices or also be employed incouprocesses now 1n other sugar house products) by 'any of the i.

devices now in use tO a syrup, the latter vis boiled to gram 1n vacuumpans, yielding a los massecuite of about the same purity as that of thecarbonated juice. crystalizers from 12 to separating in centrifugalmachines. this massecuite yields and a high purity molasses.

a high purity raw sugar After remainingin, 24 hours, and then Thecylindrical body 1 iss-preferably a strike, to lower the purity of themassccuite to from 70 to 75 purity. No definite prow portions of syrupand molasses can be speci-. fied owing to the varied purities ofl eitheror both of same; but the object is to boil the first or only molassesAproduced inA on the grain made with high puritysyrup in such proportionsas to yield. a single grade of massecuite of from 7 0 to 75 purity,which,l after treatment in crystallizers for 12 to 24 hours, and thccrystals separated from the molasses by centrifugals, yields a sugarl offrom 96 to 98 polarization and molasses of from to 60 purity. As themolasses of this purity accumulates it is dilutedwith water to 1.05 to1.06 specific grayity, and then limed with milk of lime added in theproportion of one part CaO to every live parts of sugar in solution. i

In some troublesome cases when thepur.- ity of the saccharate cakeis1ow,`it is advis-V able t9 allow/this solution to stand for af halfhour after agitating, 'and filter at at-` mospheric temperature,discardingthe precipitate after' washingin ilter, and ymake up thedeficiency of the limeremoved'ortncat the molasses with lime andcarbonicacid asx. under heatof juice. In any caseithe-di-,i luted.molasses lis nO'WA -treated in thelrestitution filter hereinafter'described. Reference isv to be had to the' accompany-pj. ing drawing,which represents a vertical tional view of therestitution filteremployed in my process.

casting provided 'With a jacket lchamber 2 from which the air may beexhausted through the pipe 3. A liner 4, of Itubingorv the like, isfitted inside of the body 1, leaving an -annular chamber 6 between them.A coil 7 is inclosed in the chamber 6, the ends 7l 7" are passedfthroughthe body 1. A cover 8 is provided, which. can be removably secured.

to the top of the body 1 by means of the swingbolts 9 hinged 'to thelugs .10 by the pins 11. The cover 18 is provided with 'a stuiiingbox8*, a gland `12 and studs 13. The bottom door 14 is hinged to lugs 15 bythe pin 16- and may beI closed to the body 1 by the studs 17. A gasl'ret18 may be interposed. A step box 19 is provided above the center of thedoor 14. A stirrerfshaft 20 is passed through the gland 12, thestuffing-box 8 and the cover 8.. Its lower en'd 20* is supported by thestep box 19. The shaft20 is revolved by any suitable means, for exampleby a.. belt on the pulley 21. Paddles or arm 22 are secured at intervals4on the shaft 20, and downwardly extending arms 23 are secured to saidshaft near its enough to permit of the cover 8 being raised to obtainaccess to the interior of the appz ratus. A small horizontal cylinder 24is provided near the bottom. of the body 1. This cylinder 24 is providedwith a nozzle 25 on its upper side preferably, a head 26 with stuing-box26a and a gland 27. A piston 28 with rod 29 are provided',a'reciproeating motion of same being obtained in any well knownmanner.'The check valve 30,'l1inged by the pin 3110 lugs 32 on the inside of thebody 1, isadaptedto seat against the seat- 24a at the inner end of thecylinder 24. The lower end of the liner 4 is cut away at 4 to clear thelugs 32 and seat 24a. f

The nozzle 34 is provided near the upper end ofthe body 1. A holev 4b is`cut in the liner 4 to register with the opening in said nozzle. Screens35 36 are provided in the "is filled by any suitable filtering medium347-.- A cover 38, removably attached to the nozzle,y .34, Y, affordsacce'ss to the filter. 'A chamber 40 is formed inv the nozzle 34 betweenthe .screen 36 and the cover 38. A pipe 39-may connect the chamber 40with a vacuum pump. The pipe 41, provided with a 'T 42, is screwed intothe bottom'of the nozzle 34 to drain the chamber 40. The pipe 43provided with'a stop cock 44 is connected to the T 42 for `wash waterdischarge. A

stop cock 45, attached tov thel pipe 41, .is connected by piping vto anysuitable seal for the discharge of waste molasses. The thermometers 4647 are provided .in the cover 8 and rnear the bottom of the body 1'respectively.

' A pipe 48 with holes 48 may be placed under the cover-8 for sprayingjuice or-other liquid. A cock 49 may be screwed into the cov'erB forbreaking the vacuum. AV proof gage 50 is provided connected to thepipe41.

In operation, the door 14 being'closed and secured by the studs 17, thecoverB is raised,

and the space inside of the lin'er 4 is filledwith a body of pulverizedmetallicoxid of alkaline earth, preferably calcium, up to within aboutsix inches of the bottom pf the hole 4". The cover 8 is then lowered andsecured to the body 1 by the swing bolts 9. The temperature of. themetallic oxid is' then lowered, by a cooling medium passed through thecoil 7, to 10 or.12 C. as indicatedby the thermometers 46 and 47. Asaving maybe effected by maintaining a vacuum in the chamber 2. Theshaft 20 is lated that the molasses passing through the l diluted withhoty juice, or other suitable liqoxid shall require from a half to vonehour I uids,

to pass in through the check valve and out through the filteringmaterial 37. The vacuum maintained, by connecting the pipe 39 with avacuum pump, increases the efficiency of the apparatus. but it can beWorked Without it.

During the passage of the cold molasses through 'the cold metallicoxidof alkaline earth, an insoluble metallic sacc'harate cake is formed.retaining almost all the cane sugar, While the non sugars together witha very smallamount of cane sugar pass ott 1n the mother liquid throughthe filter 37 and are discarded through the pipe l1, the cock l5 beingopen. At intervals during this operation, the iltrate or mother liquidas it passes olf Will be found to have a specific gravity of from 1.02to 1.03, indicated from samples drawn Jfrom the proofgage 50. .As soonas the density of the filtrate starts to increase, showing that themetallic oxid 'will remove no more cane sugar from the solution, theadmission of molasses to the nozzle 25 is sto iped and cold Water isadmitted instead. oclr tsl is opened and cock 45 closed. The saccharateWithin the apparatus is Washed with said cold Water (l0C to 12 C.)until, in the opinion ot the operator, the non-sugars surrounding andheld vvithin the sfaccharate cake are sutilciently Washed out. The WashWater as soon as it is discharged through the pipe i3 may be used indiluting the heavy molasses that Will be subjected to a repetition ofthis restitution ilter portion of the process.

The admission of cold Water through the nozzle 25 and the motion oit thepiston 28 being stopped, the pipe 39 is closed and the vacuum broken bythe coclr rihe door 1t is now opened, and the saccharate cake isdischarged trom the apparatus, the opera- `tion being aided by hot juicethrough the s rinkler )ine 4S. The saecharate caire is juice as aclarifying agent vvhere the sugar 1s set free from saccharate bycarbonio acid Ialong with the juice. A. large percentage of sugar isthus recovered that otherwise would be run to Waste.

I claim: J

l. A' process for the recovery of cane sugar. which consists ineliminating the glucose of a cane sugar solution, boiling to grain andthereby recovering a glucose-free cane sugar molasses, and recovering afurther amount of sugar from such molassesfby passing the latter througha body of alkaline earth in solid form, substantially as described.r

'2. A process for the recovery ot sugar from cane sugar molasses, whichcomprises passing a quantity of molasses cooled to from l0a to 120 C.,through a body of cold oXid of alkali earth metal, substantially asdescribed.

3. A process for the recovery of sugar from cane sugar molasses, whichcomprises sucking diluted cane sugar molasses of from 1.05 to 1.06specific gravity, and laying a temperature of from 10o to 12D C.,through a body of cold oxid of alkali earth metal, substantiallydescribed.

4. A process for the recovery of sugar from glucoseiree cane sugarmolasses, which comprises passing such molasses through a body of coldalkaline earth, thereby forming a saccharate cake` Washing such cake anddiluting vvith hotv juice, and then adding the saccharate to raiv juicefrom which the sugar is then set' free by carbonio acid, substantiallyas described.

In testimony whereof l atiix my signature, in presence of tvcowitnesses.

EUGENE ERLBATTELLE. `i'litnesses A. M. NownLL, Geo. N. Wmoiri.

and is pumped up to be added to rawI

